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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e382ed25a7278810e83c3bea1a3a17a13e3d0cb5ff1de6629289c92d4697b9' 
  AND token = 'h8nZrlanJ2SMWpkvEwww9iZNb0Z/1rl0gznZ6id4kh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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