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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e7318126c33396a26f444ca54d1f5b7c9d08cd61dee9323d69fdc061b9d65c' 
  AND token = '2N+27/rhaZwUu8GbcpVaxwT8uAUl8FBSHnA9ugZQk2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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