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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9e96d8b348f02c8d0854c29ae362969da16b96ea463ed8144b4156abaeb618' 
  AND token = 'YaQqvRbnN1stBGaH5neJUZlw95r/zf0U1xzF8XuLMO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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