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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5ecd03f7b881cd4b90535ce6ad10c3e9c3acdf11ba29b901ac1f2fc84f320b' 
  AND token = '26eZooBbN34d4nFNdDdqCtfHmV04IgVf85KyX8pa9mE=' 
  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"
    }
  }
}