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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c54e0561bd5a7ea6711209101c8c1fdc465779222a90fa9433fb92f5c2f3c09' 
  AND token = 'bTJj3S34RixjuDCS+tR2Trv2R4depPvFgQe+Skq4aBM=' 
  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"
    }
  }
}