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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e86c8bd07169c5961f6c3c919dfebe598571009a4ac3a2f9d12badb4ba2028' 
  AND token = 'CmONBRGvKaAab3ZSIQ8pvuRZ4Lc/2kTDod8EBFrOCF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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