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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d187e02bd1e3387208f7afad51d8cedaa5be61d1e41024317c4c6995dd7810' 
  AND token = '/F04oKK/gk1ikTjJBpY5D0D0+AkB5og4FZBJSW1xzpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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