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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbdedefac5f325d55df311c1fb34fbde1fd5f80064d0f84799696a2295b3037' 
  AND token = 'DB1TDnzLCV1ylPcz0ErHrfqD/G5DuOx8WkzkPMhYeBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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