SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7758517cceb8b12da32402f73288d451282d097858c169ef90921ab9f37861c' 
  AND token = 'zQ9gC8nwlM3LHIWTz3W2v25pAbD6pKjmF81qn4V/GQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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