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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd86b8e8b55357fb8e1ab2ba41e43cb8fe5e6a627da75d4fc91cb3ff6bba95e1' 
  AND token = 'lSVw5dBgQXAo/Im7+Te/aY1asx1VJNntLGf4t/3YN28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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