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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed559c25e33228d9025fa884bf859fdb004d03cb98faef1ed6d787cc0d69ad6' 
  AND token = '1SuRANpZXC5a2vOFQPRcCUgNp86l6IXfZVvfnQbhW8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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