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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3718387c46a7a6767ededc2afe70f1308fda95135a314ebed326dd97157cde2c' 
  AND token = 'JTd9nOMx1YIvoD89amaTcnxHf6STmEIMZfnIlyFZvjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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