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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34d068eacaa36cd9b9c98e15a81941eea7ca388d4b97a69f00cb0745ffdc640' 
  AND token = 'Y6tdZxJl6K8P5ui4yGOfkXF8gjstS550AVadupRvEpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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