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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15f7db936b9286fba56e5df2eaa592a6846884b81606244f68b501b159b6695' 
  AND token = '8h3p9j3rES3Oic9bhkFy/p5yp0xsX1SCfLHD9mqNPDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}