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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b312d05b1d774fb070b65b4e33b77dff118ee107a99be265f9ead38c75fecb' 
  AND token = 'Pp3ASSlnOQ8IHY9x1PjirH+9adaicqgP+L6qp8Pxn0g=' 
  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"
    }
  }
}