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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe008db2f902d40141306671f593300e3b83250f1002d8d3fed45ff8a2b26c64' 
  AND token = 'LuDrIa8e/brrRgJtGBHVPOCmjtuIvrWH6d0ezt5tddk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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