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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ce71e29b066632b947060d2066c98be50b55cecebf8954b68766cf9468ee78' 
  AND token = 'eRhyT6OFpoVAtn8V/+FtFfwSbb9ZDNg7OeklErChc5s=' 
  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"
    }
  }
}