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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a62f959ceacb3e15178493de506923d97e86fd1215d8270449d0e5910e49576' 
  AND token = 'X8/mpolFf8JdYiSob4f8K7volp6EfptQY83gBS+hPNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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