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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12985ac3ab9e03a10c22e6d9c57dc6b6ae0c3c31f3a99a76289e2ec8a60b0997' 
  AND token = '+gU3bjrr0dA9enHsZfm+ykUNXTZlAcuJ4TeB858g4vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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