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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d3739c6f636a724fa2673a7bb6a5ada6993b4ba4399c459157370733fb8bb6' 
  AND token = 'Zu/MoKCQYUbAiZfwuVO4r0N8w9JynFqqEeWR+4/4ho8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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