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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652c4306cc2bb4fbdd5286e2f3815455d706571aae14991f98618eccc14157e4' 
  AND token = 'MzFH1OFFkHlxSyx8bUIVuuMraQR4ymGvtjbofRVEvuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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