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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31ee04fa8646d1f7f8118d35e440e6a65ee9524a72ffae86e7e792db39694d2' 
  AND token = 'XmCiMD4GJpKV8EQnFo1gLadjyU9x40JS701nZr5t7+E=' 
  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"
    }
  }
}