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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8fe16d89dff2941483c2faf9ce1a2c558584e9abd0d53fb30497d7ce29be3d' 
  AND token = 'wWDuP6zNM6yFvihNM7XC+73T8UJyUyNf5LhP5KDj8Ws=' 
  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"
    }
  }
}