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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54703f99fb6f0e8db0b24310dcc73107e77b37c12e35b6dd83a2cb6fae6679c0' 
  AND token = 'YhD4+Kh4JdYmTk30522YewU6aeSRyhHI+209ShNt0v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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