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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eda7d49cbe6d5d77d443cb5e0a073f04b2cbcee2704244ff884c33d30996a06' 
  AND token = '/zhmRbfZ9LEBJ1VDwfSO2hrxyxMtO/vi1EzooQvC+xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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