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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0beb6cf5b2949614ee59d0400947338f1fa882dfcb0e529070635565564c0a3f' 
  AND token = 'K/uWuqou4gSIGIRj3YPFQJf8WukUgWSpoOpugMlfD7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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