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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e310ecdb5714ba4e28ffc151f65f7a52e1c6f6122796ba8addc226dc45eb80cf' 
  AND token = 'E/SLD3IH6PoJPKMIYwy8fJoAkA5sWGdvF/JKGHKSudU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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