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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5fadc3c63c8272608e1bfa18b2b83fb0ff912e392d09d1616e8473a27a8a91' 
  AND token = 'vMpaMRxwhMAT8nW2kIcP6Pg+wnP62RhMkUPPa2ggaP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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