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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b286acde4b54bc39c18eec34d23b5ffd64d8b77c81efcb474f62d35e1d8b20f4' 
  AND token = 'oDr7NcN90wEWMMXgUeJrIfl+VKDfBLmHq8SCW1rHTYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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