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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3317cd614a9b06a771a4f38621e2bc19039a3a2d88189c2526213ebf0645afe0' 
  AND token = 'lQ1G6wrSKWtnmPsczYKKmccSZd4Kv06+L9mFpP4ReUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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