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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b3499e58b1ee703ecce99b9775341d260aaffcb1647fa8fefed38131bd5fdf' 
  AND token = 'r6sst6vRUOiu2TDkFYyqCPO68MVto3sWOUA6C6/fH68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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