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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9d7f55d0724a50daa8b136eb06419f0bbdd613817e5012c3ff76dc31bf2e79' 
  AND token = 'UO9c9VETCVbcNDk9Q7NV3nkFe2TgcM0wPdluRhXiwfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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