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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21e9a7b35db91e9b73fa1eb383f58f6318a7216d5a4606d60839e8f15fe96b4' 
  AND token = 'GvZl2+sxzXkaDLWX14Wgofmx792zGhfSW+ZHj94ZzdQ=' 
  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"
    }
  }
}