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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ba801e23afd4f2b75adc91212984964c26c8db5050f38cb8e223ec7f4453b8' 
  AND token = '/6C5TCBBO/A9lFUPXoCr/vd1CJ9KoXj7mdM7E8Wm85g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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