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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ebf66319917a6a18707c59018389e71b9b331c110642a0bc7e0f8014ad9c11' 
  AND token = 'ciq0A86hM0xCa1IDnj+lvJ74A+BY65Kwv7oTcZZntck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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