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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807ff20740b1d6c3c04ff2a1957c203f1e025a591c7cd3bc003f4fa1bbe6a573' 
  AND token = '0eip10YzwLS8VZ5oDG9NTcIyjl6jZIfEK2TtNjm8VoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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