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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61d698c31e18bbe34ab80bb7c5f8ef2e80937197b50db1fef62ad95a4a44f51' 
  AND token = 'rlnSNn5jVPEt04MmSLFk/hlyec7sO+8LwZMZs2N6YA4=' 
  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"
    }
  }
}