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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03410d5f4dcc0574e272877a6475fde20397fa57da0dabeb1ade9bcce53369fe' 
  AND token = 'W305s/4+cu9BGzlIAPTLlyOQc1ugvM/COnDZ2TwY/4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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