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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9941281ebcd4731b7ca6a54e61e93a55e6a6d3f333ffac620a167059e5b9bc7' 
  AND token = '5dJDmR1vigVetHwn5uqX2sPeXHPhvILM8Xyh3q0fGTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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