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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36531925a28f927ea32cacd95337b8fe880eb390750de14c9d11f5ed69fc4de7' 
  AND token = 'gxumqTlbkyflKpLpqoeSgYuX0+6h8XyKq4gtSosSSdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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