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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11af4722302ac545f3c03a7efd4b8e0f9d992eb9ba0dc2fd3b77a55e735ffed' 
  AND token = 'C00QuF0qQmyxY7HQ/wv2RKx0yVPZqEE9qUivP0FsEeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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