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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f33d6b8ad3b4fe83c57165f1a9c2e2bd5c8967b3eb418a5a9c15bbcca1572d28' 
  AND token = '/SkokrMKv4BIQT9z+h5dCpAJQrg2QD72jKf227b1Fs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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