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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e786fcc7e406f9fb14ab9c2d29ca466ce40da5e7376898314c8bfbc9238f53c4' 
  AND token = 'n6yjLv8solgpF/9UmWKi4FyCYQWI2rCu/jC/J61s4JA=' 
  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"
    }
  }
}