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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee482aa17e73043ab8a4ffad2394c1fdc5da2f637ef47568b7a3a4f5a2b768dc' 
  AND token = 'F+7flSNMYWeBo/zvYm4bMH4S26sOhahn8MENRMWpNp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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