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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b63168361d78f560af7ef8ccc3311041d1714ddc592f56a84c16ccdceb8ead' 
  AND token = 'TrIVkmtZsmsrECIvRvXqMjO5/iH2ghEZ1yT+06H5rpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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