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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ece0492a50f03a134bc8fb6b6f997c4f7b2acec7634248947c88bcbd431c5a' 
  AND token = 'tqWs64jRElN3D9WXqCk98DSYhISPUOCTToYf8Oh6z2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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