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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747be3db833d0172e7e14581966fdfb384e44505b7bf104eb3dcf07fbf8222f2' 
  AND token = 'EW0K+aySsCc2uAeYBa0QXVYyy4k9/FQ2QO4ti/71n94=' 
  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"
    }
  }
}