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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa435160c92c071f50271d5db40c4513a1fc5c0c3c6f39e855f92b36a66e6da' 
  AND token = 'QswSrQPM4SPEbOA97iOSfC1RkuNM76C05sUkjderhR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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