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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe8ce252913e8f2ab568257bbc04396437be873e427c6c1368990c6ea51d58d' 
  AND token = 'JsdF+5Zp6sawGt7/ffAH5c9V8y1F1WtpAdmiQusTcYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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