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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5320a1b575189ea613ee702667a8e568d07f7c06bb0b64a50ae3a7b50a0050e8' 
  AND token = '9KJUa9qY47B4MGg703Xx/KV/lysihZ2tNPQNyYyNI8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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