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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e083b55b6abad491413d4ac02d64f1710500cb1632db0cc01886633d2df6a2a5' 
  AND token = 'xoXaoRZRmNd8Yot73DrLUNBtJPtctFjNg8vVB/I6J5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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