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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfb23b5be3a7e6b32328d0c0895c04ee528958da6e09192b1231844b24bcad3' 
  AND token = 'G5rUuLZXKzHyURRF/gS6vr8Uol5imQF0g98045YWl5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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