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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc71e3e590fb6c48d0e3495f30e48a11b6f9a5e1316900bbde8e4c519882eea' 
  AND token = 'twyNE1AodOIhC49THlZ/nADJKh4/7AJa3FvdKIDsvL0=' 
  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"
    }
  }
}