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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a911eb99340c939eb9589de42fc2f8a1d11a10cb65a802e105a582cd6a1a577c' 
  AND token = 'Nna7pwMZQGO99+b/pjeKBFgLcE7lvNzL405YYr1h/Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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