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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef726fa05422538a48087d5e647f188f910bf1212e24436cf0eff2312f1c0ccb' 
  AND token = 'yamWN9UI9n+xaj+eJbP4ijfH9HNbBFqG5SATXYHgboU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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