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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739fe982e943880646d0e5d960711b294c04c7f900f46234eabe965493cf43cc' 
  AND token = 'jT8A6NVFF77JH7PL5r0L6yYNAMQRHxwhUfyM4a3PLXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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