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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2de7397974e4162047e3bf794ccca3fde5c70ffb1208a4a508ea77db798be8' 
  AND token = 'JwhweLM7gVQWS3CNAzZK84OAZ068h2lH4bYpMDl3q5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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