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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8834b54b3ea68e5bf7b1a0b8d93b4778edab0bdb6f4edfbdaf3dd1a9a202a7b' 
  AND token = 'aXmW64Q0trH6wUsQLgL2QgzOKqoFlPokMMrDyBt7U1I=' 
  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"
    }
  }
}