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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78a7adada58def2f76e728bc6dd6f510eacc9327a6cfcdbd72d8351b6b0ff0c' 
  AND token = 'jfoTcVM16Opy4l6alZg86Aq5MJJQd+hei2wMLr9nam4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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