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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e8ea3bcf48f111de40e3557c9ed6975344b4d348d077ffded549b0c84b8236' 
  AND token = 'nbs9QaIuBNLyciYOzzMn6sDE58a5XIwnAwvDXfZ8LRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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