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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f543b807a454701b09a8b4f9cc12a8c12fc2f193c24eaa932c16287d33ca167' 
  AND token = '12j/u5v7mtxYXzjYwkC086F/WKlFMMoxhNU8evT0qlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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