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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb502b027bf94839fa4808f85e115e8e2acf442aee394034ec0d25072121d9e' 
  AND token = '40mbHssv+s6oSBxzR0i+WsBdnxywy8XeaYE4T7buzuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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