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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49dbb1a93c52a088d4a2f45b31d17d6f5ae9e0f5ff3747947a35e04bca5393eb' 
  AND token = 'lWWrcG3NeUGOoNxXouZbSBmsdp8mdH8SgST8COEWtMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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